package org.apache.maven.repository.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.Snapshot;
import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
import org.apache.maven.artifact.repository.metadata.Versioning;
import org.eclipse.aether.artifact.Artifact;

/**
 * @author Benjamin Bentmann
 */
final class LocalSnapshotMetadata extends MavenMetadata {

  private final Collection<Artifact> artifacts = new ArrayList<Artifact>();

  private final boolean legacyFormat;

  public LocalSnapshotMetadata(Artifact artifact, boolean legacyFormat) {
    super(createMetadata(artifact, legacyFormat), null);
    this.legacyFormat = legacyFormat;
  }

  public LocalSnapshotMetadata(Metadata metadata, File file, boolean legacyFormat) {
    super(metadata, file);
    this.legacyFormat = legacyFormat;
  }

  private static Metadata createMetadata(Artifact artifact, boolean legacyFormat) {
    Snapshot snapshot = new Snapshot();
    snapshot.setLocalCopy(true);
    Versioning versioning = new Versioning();
    versioning.setSnapshot(snapshot);

    Metadata metadata = new Metadata();
    metadata.setVersioning(versioning);
    metadata.setGroupId(artifact.getGroupId());
    metadata.setArtifactId(artifact.getArtifactId());
    metadata.setVersion(artifact.getBaseVersion());

    if (!legacyFormat) {
      metadata.setModelVersion("1.1.0");
    }

    return metadata;
  }

  public void bind(Artifact artifact) {
    artifacts.add(artifact);
  }

  public MavenMetadata setFile(File file) {
    return new LocalSnapshotMetadata(metadata, file, legacyFormat);
  }

  public Object getKey() {
    return getGroupId() + ':' + getArtifactId() + ':' + getVersion();
  }

  public static Object getKey(Artifact artifact) {
    return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
  }

  @Override
  protected void merge(Metadata recessive) {
    metadata.getVersioning().updateTimestamp();

    if (!legacyFormat) {
      String lastUpdated = metadata.getVersioning().getLastUpdated();

      Map<String, SnapshotVersion> versions = new LinkedHashMap<String, SnapshotVersion>();

      for (Artifact artifact : artifacts) {
        SnapshotVersion sv = new SnapshotVersion();
        sv.setClassifier(artifact.getClassifier());
        sv.setExtension(artifact.getExtension());
        sv.setVersion(getVersion());
        sv.setUpdated(lastUpdated);
        versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
      }

      Versioning versioning = recessive.getVersioning();
      if (versioning != null) {
        for (SnapshotVersion sv : versioning.getSnapshotVersions()) {
          String key = getKey(sv.getClassifier(), sv.getExtension());
          if (!versions.containsKey(key)) {
            versions.put(key, sv);
          }
        }
      }

      metadata.getVersioning().setSnapshotVersions(new ArrayList<SnapshotVersion>(versions.values()));
    }

    artifacts.clear();
  }

  private String getKey(String classifier, String extension) {
    return classifier + ':' + extension;
  }

  public String getGroupId() {
    return metadata.getGroupId();
  }

  public String getArtifactId() {
    return metadata.getArtifactId();
  }

  public String getVersion() {
    return metadata.getVersion();
  }

  public Nature getNature() {
    return Nature.SNAPSHOT;
  }

}